New Twiddle

application.controller.js

import Ember from 'ember';
let i=0;
export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  
  xxx: (function() {
    return new Ember.RSVP.Promise(function(r){r(i++)});
  }).property('appName'),
  
  yyy: (function() {
    return Ember.guidFor(this.get('xxx'));
  }).property('xxx'),
  
  
  init: function() {
    let _this = this
    Ember.run.later(this, function(){
      this.get('xxx').then(function(v){
        _this.set('appName', v);
        _this.init();
      })}, 1000);
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{yyy}}
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "1.13.11",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "1.13.11"
  }
}